Conflicts:
	packages/rocketchat-channel-settings/server/methods/saveRoomSettings.coffee
	packages/rocketchat-lib/server/models/Rooms.coffee
	packages/rocketchat-ui/lib/RoomManager.coffee
	server/startup/roomPublishes.coffee

Fix pin and star

Fixed several english issues in the Incoming Webhooks settings page

Support Integration webhook calls originating from client browsers

Most modern browser will issue a pre-flight request with HTTP OPTION method before the actual asynchronous POST.    This adds a CORS supporting option endpoint.

[WIP] Livechat manager

Changes to layout and added infinite scroll to mentions bar

Mentions bar

Conflicts:
	server/methods/loadHistory.coffee

Adjust layout direction based on user's language

Debug level setting - closes #1687